Soraya and the Dragon (Soraya, Book #2)

"Fourth grader Soraya misses her only friend. It's been months since she met a mermaid named Estelle and rescued her from Bayside Aquarium. Soraya is sure no one else will ever like her because she's too weird. When her class goes on a field trip to Balabrook Caverns, Soraya sneaks away down a secret tunnel. Soon she is pulled in to a new adventure filled with magic, danger. and friendship where she least expected to find it. "-Provided by publisher.